Sum of the element occurence

3 次查看（过去 30 天）
yiwen yim
yiwen yim 2018-4-29
评论： Ameer Hamza 2018-4-29
Greetings Matlab Community,
I've manage to sum up the occurrence of number 2 of the entire matrix by using this,
chromo = [1 1 2 4 6 1 ; 2 1 3 5 7 2];
sum(chromo(:) == 2)
How do i sum up the occurrence of number 2 in just a row in the matrix and not the entire matrix?

请先登录，再回答此问题。

采纳的回答

Ameer Hamza
Ameer Hamza 2018-4-29
If A is the matrix, you can do this as follow
numOfTwos = sum(A==2, 2);
myResult = numOfTwos(rowNumber);
The above will numOfTwos will give number fo two in all the rows of matrix A. If you just want it for one row, use
numOfTwos = sum(A(rowNumber, :) ==2, 2);
  7 个评论
显示 5更早的评论
Ameer Hamza
Ameer Hamza 2018-4-29
@yiwen yim answer moved here
"Also for a particular row."
Ameer Hamza
Ameer Hamza 2018-4-29
For particular row you can do this
numOfTwos = sum(A(3, :) ==2, 2);
It will tell you number of twos in row 3.

请先登录，再进行评论。

更多回答（2 个）

yiwen yim
yiwen yim 2018-4-29
I would like to know how to do it for each row.
  1 个评论
Ameer Hamza
Ameer Hamza 2018-4-29
Please delete this answer, and discuss it in the comment section.

请先登录，再进行评论。

yiwen yim
yiwen yim 2018-4-29
Also for a particular row.

类别

在 Help Center 和 File Exchange 中查找有关 Matrix Indexing 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by